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| Registros recuperados: 306 | |
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| Littaye-mariette, Anne; Mazurie, Joseph. |
| Since 1989, an homogeneous Crassostrea gigas oyster stock has been distributed once a year on several rearing sites in Brittany (3 populations per site). The main quantitative and qualitative growth descriptors, which reflect water quality effects during the monitoring period, are estimated at the end of each year. The 1989-1992 analysis prompted us to describe various growth responses correlated to biotops: oyster production in open areas influenced by oceanic waters was fairly constant in quality, including size and Polydora sp. infestation. In contrast, oysters in estuarine areas, partly affected by eutrophication (e.g., Aber Benoît, Pen Bé), or with a low carrying capacity, were characterized by weight and Polydora sp. infestation heterogeneity. These... |
| Tipo: Text |
Palavras-chave: Polydora; Condition Index; Mortality; Growth; Monitoring; Oyster; Crassostrea gigas; Brittany; Polydora; Indice de condition; Mortalité; Croissance; Réseau; Huître; Crassostrea gigas; Bretagne. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/rapport-1639.pdf |
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| Saulnier, Denis; Pepin, Jean-francois; Guesdon, Stephane; Degremont, Lionel; Faury, Nicole; Haffner, Philippe; Renault, Tristan; Travers, Marie-agnes; Tourbiez, Delphine; Geairon, Philippe; Le Moine, Olivier; Seugnet, Jean-luc; Soletchnik, Patrick. |
| This study aims to improve understanding of causes of mortalities in oyster Crassostrea gigas in pertuis charentais related to environmental parameters and the kinetics of targeted infectious agents, such as bacteria Vibrio splendidus (group ) and V. aestuarianus and Ostreid herpesvirus OsHV-1. Two sampling campaigns were carried out on the site of Agnas in 2009 and 2010, before, during or following mortality events of spat from March to September. The approach is to detect and quantify in short time step infectious agents from tissues of farmed oysters placed on rack and in various samples taken nearby: native oysters and other species (wild mussels and barnacles), seawater and sediment. With physical and chemical automatic probes placed on the site,... |
| Tipo: Text |
Palavras-chave: Huître creuse; Crassostrea gigas; Mortalité; Virus herpès; Vibrions; Environnement; Pertuis Charentais; Pacific oyster; Crassostrea gigas; Mortality; Herpes virus; Vibrios; Environment; Pertuis Charentais. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00058/16920/14400.pdf |
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| Goyard, Emmanuel. |
| What is REMORA? REMORA −REseau MOllusques du département Ressources Aquacoles− (Aquaculture Resources Department Mollusc Network) is a surveillance network dedicated to the growth of hollow oysters Crassostrea gigas. In the past and in most production areas, observations were made on a regular basis. In 1993, homogenising experimental protocols between the different laboratories involved was decided, as well as using a common initial oyster batch, therefore organizing a network covering all of the French coasts. This network aims at providing, each year, the production's basic characteristics found in main oyster beds (growth reference). It also better characterizes variations and shows potential tendencies. |
| Tipo: Text |
Palavras-chave: Mortality; France; Network of monitoring; Crassostrea gigas; Growth; Oyster culture. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/1995/rapport-1755.pdf |
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| Fleury, Pierre-gildas; Simonne, Charlotte; Claude, Serge; Palvadeau, Hubert; Guilpain, Patrice; D'Amico, Florence; Le Gall, Patrik; Vercelli, Catherine; Pien, C. |
| The network REMORA by IFREMER quarterly follows each year 2 batches of Pacific cupped oysters Crassostrea gigas ("juveniles"= 1 year old; and "adults" = 2 years old) on various sites among the main French oyster areas. The network monitored 46 sites in 2004, including the 7 new sites added in 2003. The network REMORA thus assess seasonal survival, growth and quality of cupped oysters. It is a tool for trend estimations, ecosystem management and a reference frame for scientific studies. Globally speaking, the year 2004 was a good year for oyster farming, with a low mortality and a fast growth. The rearing yield (survival x growth) reached 2.0 for adults instead of 1.8 usually. However, the meat index remained close to the average inter annual data.... |
| Tipo: Text |
Palavras-chave: Polydora; Quality; Growth; Mortality; Crassostrea gigas; Pacific Cupped oyster; France; REMORA; Polydora; Qualité; Croissance; Mortalité; Crassostrea gigas; Huître creuse; France; REMORA. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/rapport-2413.pdf |
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| Fleury, Pierre-gildas; Goyard, Emmanuel; Mazurie, Joseph; Claude, Serge; Bouget, Jean-francois; Langlade, Aime; Le Coguic, Marie-jo. |
| The network IFREMER/REMORA has watched every year, since 1993, from February to December, mortality, growth and quality criteria of two oyster class-size ("juveniles" of the first-year c1ass and "adults" of the second year c1ass), distributed among various stations of the French oyster areas. This has provided a quite standard and simple annual assessment of the rearing results, generally tallied with professional observations. From year to year, data series have been obtained, from which mean values (references), chronological trends or spatial differences can be analysed. Results in Brittany, from 1993 to 1998, show that, in a "normal" year, 30 g oysters grow to 60-80 g at the end of the year, with a mortality rate of 10-15%. Mortality occures mainly in... |
| Tipo: Text |
Palavras-chave: REMORA; Bretagne; Huître creuse; Crassostrea gigas; Mortalité; Croissance; Qualité; Polydora; REMORA; Brittany (France); Gigas oyster; Crassostrea gigas; Mortality; Growth; Quality; Polydora. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00113/22386/20081.pdf |
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| Soletchnik, Patrick; Le Moine, Olivier; Faury, Nicole; Guilpain, Patrice; Geairon, Philippe; Razet, Daniel; Madec, Patrick; Robert, Stephane; Taillade, Sylvie; Doner, Anne. |
| This report presents results obtained by the LCPC in coastal Ecology. The contributions of the LCPC, as partner associated with the genetic studies, do not appear in this report. This report is divided in 5 parts of differing importance : • Task 2.2.3. A "multi-disciplinary study of the DYNAmics of estival mortalities of Crassostrea gigas in the Marenne - Oléron Basin (Dynamo-2002)"; study developed and directed by the LCPC after the “plat-table” C. gigas mortality model in the Marennes- Oleron Basin. • Task 2.3 . "Influence of autumn and winter conditions on the maturation of parents (phase 1) and on the survival of their offspring (phase 2) (Gegen). Action directed by the LCPC. • Task 2.2.1. " Dynamics of mortality, reproduction and spawning.... |
| Tipo: Text |
Palavras-chave: MOREST; Crassostrea gigas; Mortalité; Ecologie côtière; MOREST; Crassostrea gigas; Mortality; Coastal Ecology. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00164/27549/25714.pdf |
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| Fleury, Pierre-gildas; Claude, Serge; Bouget, Jean-francois; Langlade, Aime; Le Coguic, Yvette. |
| The network IFREMER/ REMORA watches every year, from February to December, mortality, growth and quality criteria of two oyster batches ("juveniles" = one-year class ; and "adults" = two-years class), distributed among various stations of the main French oyster areas. This network is a tool for trend estimations (geographic and chronological, on the national scale). With regard to the Breton stations of the network, the year 1999 showed a small increase of mortality rates, both in adults alter their transfer on the REMORA stations and in juveniles during the Summer season. this was particularly observed in Morlaix, Aber Benoît and Pen-Bé. Although it was better than 1998, the year 1999 was a poor year for growth, especially in North Brittany (62.5 g in... |
| Tipo: Text |
Palavras-chave: REMORA; Bretagne; Huître creuse; Mortalité; Croissance; Qualité commerciale; Polydora; REMORA; Brittany; Gigas oyster; Mortality; Growth; Commercial quality; Polydora. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00113/22388/20083.pdf |
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| De Montaudouin, X.; Bazairi, H.; Culloty, S.. |
| We quantified the effect of trematode parasites in cockles through a 303 d transplant experiment. Cockles were sampled in 3 different sites on the southwest coast of France characterized by 3 different trematode communities, i.e. Royan (RO): high Meiogymnophallus minutus abundance near cockle heart, South Arguin (SA): high Himasthla interrupta abundance in the mantle margin, and North Arguin (NA): almost free of trematodes. Sampled cockles were individually tagged and placed in different cages at Banc d'Arguin, Arcachon Bay. At the end of the experiment, RO cockles had lost their trematodes, highlighting the fact that trematode lifespan can be short, while SA cockles maintained their trematode load. When cockles were the second intermediate host, there was... |
| Tipo: Text |
Palavras-chave: Cerastoderma edule; Parasitism; Growth; Mortality; Condition index; Transplant experiment. |
| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00375/48640/49090.pdf |
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| David, Elise; Boudry, Pierre; Degremont, Lionel; Tanguy, Amelie; Quere, N; Samain, Jean-francois; Moraga, D. |
| Large-scale mortality events have been observed in Pacific oyster Crassostrea gigas on the west coast of France since the early 1980s, particularly during summer. In order to understand the causes of this mortality, two generations of oysters from single-pair matings were studied in three sites on the French Atlantic coast (Baie-des-Veys, Auray and Ronce-les-Bains). The present paper examines the role of two candidate genes in the susceptibility of oysters to summer mortality, and the selective pressure exerted by such mortality on their polymorphism. Glutamine synthetase (amino-acid metabolism) and delta-9 desaturase (lipid metabolism) genes were studied in the successive generations, using polymerase chain reaction single-strand conformation polymorphism... |
| Tipo: Text |
Palavras-chave: SSCP; Mortality; Glutamine synthetase; Delta 9 desaturase; Crassostrea gigas. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3040.pdf |
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| Richard, Marion; Bec, Beatrice; Vanhuysse, Charles; Mas, Sébastien; Parin, David; Chantalat, Camila; Le Gall, Patrik; Fiandrino, Annie; Lagarde, Franck; Mortreux, Serge; Ouisse, Vincent; Rolland, Jean-luc; Degut, Anaïs; Hatey, Elise; Fortune, Martine; Roque D'Orbcastel, Emmanuelle; Messiaen, Gregory; Munaron, Dominique; Callier, Myriam; Oheix, Jocelyne; Derolez, Valerie; Mostajir, Behzad. |
| Oysters modify the planktonic microbial community structure by their filtration and NH4 excretion activities. While many studies have been conducted on this subject with adult oysters, none had been carried out in situ with juveniles. Pacific oyster juveniles (Magallana gigas, previously Crassostrea gigas) died massively all over the world since 2008 in relation with OsHV-1 infection. During mortality episodes, sick and dead oysters are not separated from healthy live ones, and left to decay in the surrounding environment, with unknown consequences for the nutrient cycle and planktonic microbial components (PMC). The present study aimed to elucidate for the first time the interactions between oyster juveniles and PMC during a mortality episode. Innovative... |
| Tipo: Text |
Palavras-chave: Magallana gigas; Crassostrea gigas; Spat; OsHV-1 mu Var; Mortality; Picoplankton; Heterotrophic flagellates; Ciliates; Uronema; Balanion. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00474/58559/61115.pdf |
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| Renault, Tristan; Lipart, Cecile; Arzul, Isabelle. |
| Sporadic high mortalities were reported in June 1997 among hatchery-reared larval Manila clam Ruditapes philippinarum in a French commercial hatchery. Cellular abnormalities were observed in semi-thin sections in affected animals. Transmission electron microscopy revealed the presence of herpes-like virus particles in larvae. This is the first description of a herpes-like virus infection in larval R. philippinarum, a non-ostreid bivalve species. Virus particles were similar to other herpes-like viruses described from different oyster species with respect to ultrastructure and morphogenesis. Electron microscopic examination also demonstrated cells with condensed chromatin and extensive perinuclear fragmentation of chromatin. Like viruses infecting oysters,... |
| Tipo: Text |
Palavras-chave: Apoptosis; Virus replication; Mortality; Ruditapes philippinarum; Manila clam; Herpes like virus. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-816.pdf |
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| Barbosa-solomieu, Valerie; Renault, Tristan; Travers, Marie-agnes. |
| Massive mortality outbreaks in cultured bivalves have been reported worldwide and they have been associated with infection by a range of viral and bacterial pathogens. Due to their economic and social impact, these episodes constitute a particularly sensitive issue in Pacific oyster (Crassostrea gigas) production. Since 2008, mortality outbreaks affecting C. gigas have increased in terms of intensity and geographic distribution. Epidemiologic surveys have lead to the incrimination of pathogens, specifically OsHV-1 and bacteria of the Vibrio genus, in particular Vibrio aestuarianus. Pathogen diversity may partially account for the variability in the outcome of infections. Host factors (age, reproductive status…) including their genetic background that has... |
| Tipo: Text |
Palavras-chave: Pacific oyster; Spat; OsHV-1; Vibrio aestuarianus; Mortality. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00274/38534/37051.pdf |
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| Degremont, Lionel. |
| As with summer mortalities reported in France between 2001 and 2006, mortality caused by the Ostreid herpesvirus 1 (OsHV-1) in Crassostrea gigas affects mostly juveniles, although adults can also be impacted to a small extent. This could suggest that both mortalities have similar causes and that establishment of resistance, in particular to the Ostreid herpesvirus 1 (OsHV-1), depends on either the size or the age of oysters. The present study reports an investigation of both size and age using three cohorts produced during winter and three produced during summer. Each cohort contained oysters genetically selected to be resistant or susceptible to the summer mortality phenomenon, as well as unselected control oysters. Any abnormal mortality was recorded... |
| Tipo: Text |
Palavras-chave: Mortality; Crassostrea gigas; Disease resistance; Size; Age; Ostreid herpesvirus. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00157/26799/24909.pdf |
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| Registros recuperados: 306 | |
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